Good info guys.
Such details (CZ twist) etc. is most useful, thanks.
The 270 TSX in the. 375 H&H seems to be very popular.
The 300 NPT in the .375 H&H has had less than stellar reviews, the A-Frame seems a better choice.
The 350 TSX in the Rigby is an interesting concept. How about the 400 A-Frame vs. the 350 TSX?
DF